i have this issue.
I already implemented leaderboards and achievements, both work on my android game. BUT, leaderboard is always offline.. i mean, nothing is displayed, only this, a cloud and below this " NO INTERNET CONNECTION TRY AGAIN" ... theres no information about this in google i think. anyone there knows the answer ? Thank you very much !
if you want to see by yourself the problem write here and i can give you the name of my game so you can download it from playstore or idk. ty